End of the millennium - end of single thoracic artery graft. Two thoracic arteries - standard for the next millennium? Early clinical results and analysis of risk factors in 1487 patients with bilateral internal thoracic artery grafts. - Gansera,B.; Günzinger,R.; Angelis,I.; Neumaier-Prauser,P.; Kemkes,B.M. (Thorac Cardiovasc Surg, 2001)